Return-Path: <linux-rt-users-owner@vger.kernel.org>
Received: from rack3slot8.osadl.org (rack3slot8.osadl.org [127.0.0.1])
	by rack3slot8.osadl.org (8.13.8/8.13.8/CE-2010120801) with ESMTP id r1DGh7dd011717
	for <ce@thllin.ceag.ch>; Wed, 13 Feb 2013 17:43:07 +0100
Received: from toro.web-alm.net (uucp@localhost)
	by rack3slot8.osadl.org (8.13.8/8.13.8/Submit) with bsmtp id r1DGh7CY011715
	for ce@mailgate.computer-experts.de; Wed, 13 Feb 2013 17:43:07 +0100
Received: from www.osadl.org (www.osadl.org [62.245.132.105])
	by toro.web-alm.net (8.12.11.20060308/8.12.11/Web-Alm-2003112001) with ESMTP id r1DGgRZx024011
	for <ce@ceag.ch>; Wed, 13 Feb 2013 17:42:27 +0100
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
	by www.osadl.org (8.13.8/8.13.8/OSADL-2007092901) with ESMTP id r1DGgM29002951
	for <Carsten.Emde@osadl.org>; Wed, 13 Feb 2013 17:42:23 +0100
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S934550Ab3BMQlj (ORCPT <rfc822;Carsten.Emde@osadl.org>);
	Wed, 13 Feb 2013 11:41:39 -0500
Received: from www.linutronix.de ([62.245.132.108]:60058 "EHLO
	Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S934367Ab3BMQlf (ORCPT
	<rfc822;linux-rt-users@vger.kernel.org>);
	Wed, 13 Feb 2013 11:41:35 -0500
Received: from localhost ([127.0.0.1] helo=localhost.localdomain)
	by Galois.linutronix.de with esmtp (Exim 4.72)
	(envelope-from <bigeasy@linutronix.de>)
	id 1U5exX-0005iT-F0; Wed, 13 Feb 2013 17:13:23 +0100
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
        Carsten Emde <C.Emde@osadl.org>, Thomas Gleixner <tglx@linutronix.de>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 16/16] slub: Enable irqs for __GFP_WAIT
Date: 	Wed, 13 Feb 2013 17:12:11 +0100
Message-Id: <1360771932-27150-17-git-send-email-bigeasy@linutronix.de>
X-Mailer: git-send-email 1.7.10.4
In-Reply-To: <1360771932-27150-1-git-send-email-bigeasy@linutronix.de>
References: <1360771932-27150-1-git-send-email-bigeasy@linutronix.de>
X-Linutronix-Spam-Score: -1.0
X-Linutronix-Spam-Level: -
X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required,  ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001
Sender: linux-rt-users-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-rt-users.vger.kernel.org>
X-Mailing-List: 	linux-rt-users@vger.kernel.org
X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW
	autolearn=ham version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on rack3slot8.osadl.org
X-Virus-Scanned: ClamAV version 0.94.2, clamav-milter version 0.94.2 on rack3slot8.osadl.org
X-Virus-Status: Clean

From: Thomas Gleixner <tglx@linutronix.de>

SYSTEM_RUNNING might be too late for enabling interrupts. Allocations
with GFP_WAIT can happen before that. So use this as an indicator.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bigeasy@linutronix: fix !page conflict]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---

 mm/slub.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

Index: linux-3.2.35-rt53/mm/slub.c
===================================================================
@ linux-3.2.35-rt53/mm/slub.c:1288 @ static struct page *allocate_slab(struct
 	struct page *page;
 	struct kmem_cache_order_objects oo = s->oo;
 	gfp_t alloc_gfp;
+	bool enableirqs;
 
 	flags &= gfp_allowed_mask;
 
+	enableirqs = (flags & __GFP_WAIT) != 0;
 #ifdef CONFIG_PREEMPT_RT_FULL
-	if (system_state == SYSTEM_RUNNING)
-#else
-	if (flags & __GFP_WAIT)
+	enableirqs |= system_state == SYSTEM_RUNNING;
 #endif
+	if (enableirqs)
 		local_irq_enable();
 
 	flags |= s->allocflags;
@ linux-3.2.35-rt53/mm/slub.c:1320 @ static struct page *allocate_slab(struct
 			stat(s, ORDER_FALLBACK);
 	}
 
-#ifdef CONFIG_PREEMPT_RT_FULL
-	if (system_state == SYSTEM_RUNNING)
-#else
-	if (flags & __GFP_WAIT)
-#endif
+	if (enableirqs)
 		local_irq_disable();
 
 	if (!page)